4 female students who sought to join ISIS attended Mississauga schoolAl-Huda Islamic Institute's sister school in Pakistan connected to mass shooting in California

A girl and three young women left Canada to join ISIS in Syria after studying at the Al-Huda Islamic Institute in Mississauga, Ont. — a school whose sister institution in Pakistan is now connected to the mass shooting in California.

It's unclear exactly when the Canadian students travelled overseas, but sources have confirmed they all left in the last two years after attending the school founded by controversial female Islamic scholar Farhat Hashmi.

Hashmi's ultra-conservative teachings in lectures and online have faced criticism for promoting an extreme wifely subservience to a husband.